Hermanus thomassen and jacobus krop



H. THOMASSEN & J. KROP.

. (No Model.)

UORNISH BOILER.

rouma. wnsnmmon. u. c.

Patented June 7, 1898.

UNITED PATENT OF ICE.

HERMANUS THOMASSEN AND 'JQAOOBUS KROP, or AMSTERDAM,

NETHERLANDS.

I 'CO RNlSH BorLE R.

SPECIFICATION forming part Of Letters Patent NO. 605,149, dated June 7, 1898. Application filed October 9, 1897. Seria1N0. 654,632. (No model.)

Toall whom it may concern:

Be it known that we, HERMANUS THoMA's- SEN and JAooBUs KROP, subjects of the Queen of the Netherlands, residing in Amsterdam, Netherlands, have invented certain new and useful Improvements in Cornish Boilers, of which the following is a specification.

Our invention relates to an arrangement in Cornish steam-boilers by "which. the gases of combustion as they leave'the flame-tube are thoroughly mixed with each other and with the air required for combustion and again concentrated, perfect combustion I and, increased yield of heat to the walls of the flametube being thus eifected.

The arrangement, which may be appliedto any boiler of the type named, including those furnished with Galloway tubes, consists in placing a ring at the rear'endof the flame-- tube and at a short distance in front of. it a disk, this latter leaving a small annular space between itself and the wall of the flame-tube. The area of this annular space between the disk and the flame-tubeand also that of the central aperture-of the ring referred to are each substantially equal to the area of the free space over the fire-bridge. ,The effect of this arrangement is that the grate area may be reduced to the extent of one-half and a saving of fuel to the amount of from twentyfive to fifty per cent. effected, while the production of steam remains the same. I'

The accompanying drawings illustrate the application of our invention to a Galloway boiler. 9

Figure 1' is a longitudinal section of the boilers. Fig. 2 is a back elevationof the same; and Fig. 3 is a front elevation of "the disk designed to be inserted in the flame-tube};

' In the rear end of the flame-tube g there is inserted a ring a, the outercircumferen'ce' of which is in contact with'the inner wall ofthe flame-tube and the central opening a of which is of substantially the same area as the free space f over thefirebridge (1. .Thering a may be made of metahonof fireproof material; but it is best to construct it of-fire-clayl In front of thering a in theinteriorf'ofthe flame-tube g is 'placed the disk I), which" is best made of castiron and is composed of two 7 parts united together, as shown in Fig. 3. The disk I; may, however, be equally Well constructed of fireproof material or of sheet iron or steel. It is arranged centrally in the flametube at a smalldistance from the ring a and is secured in position by means of wedgethrough the opening between the disk b and theflame-tube, and are then forced together by thering a. At the point where the contraction occurs a further intimate mixture of the gases of combustion and the air takes place, so that the gases burn while producing a great heat and pass into the lateral flues as pointed flames.

By making the area of the annular space between the disk I and the flame-tube g and that of the central aperture of the ring a sub stantially equal to the area of the free space over the fire-bridgesuch mixture of air and gases is accomplished while securing a very uniform speedfor said air and gases as they pass through the boiler.

The arrangement described affords the advantage that it is susceptible of application without difficulty to Cornish boilers'already at work and that it has not the efiect of making the flame-tube less accessible.

By constructing disks b in sections we facilitate their introduction and insertion into old boilers and provide for readily detaching the same in case the interiorof a shell is to be cleaned. Having now particularly described andas;

certained the nature of our said invention and in-what manner the same isto be perf(" rme d,

we declare that what We claim issectional disk, wedgepieces for arranging the same centrally in the flame-tube, a suitable space being left between said disk and said tube, and a ring arranged behind the disk, substantially as set forth.

2. In a Cornish stean1-boiler, the combina- 5 tion with the flame-tube, of the fire-bridge, a

disk arranged centrally in the flame-tube, an

annular space being left between said disk and said tube, and a ring arranged behind the disk the free space over the fire-bridge,

10 the annular space around said disk and the central aperture of said ring being of substantially equal areas, all as set forth.

In testimony whereof we have signed our names to this specification in the presence of two subscribing Witnesses.

HERMANUS THOMASSEN. JACOBUS KROP. lVitnesses:

Joni-inns lhixnlnkus vex mm Mum-1, Jr Knms JAN Mum; WIXGST. 

